Alternating current and direct current integrated sensor and current detection framework

Abstract

The invention discloses an alternating current and direct current integrated sensor and a current detection framework. The alternating current and direct current integrated sensor comprises a CT coil, a plurality of Hall elements and a plurality of C-shaped magnetic cores. The plurality of magnetic cores are arranged close to each other through one side far away from the air gap, and a to-be-detected wire is suitable for independently penetrating through a single magnetic core; the CT coil is wound around the close area of all the magnetic cores to form an alternating current sensor used for detecting the alternating current of the wire in a matched mode. And the Hall elements are correspondingly arranged at the air gap positions of the magnetic cores, so that the Hall elements and the magnetic cores are matched to form a direct current sensor for detecting the direct current of the wire. The current detection framework adopts the alternating current and direct current integrated sensor to detect the wire current of the inverter system. The inverter has the beneficial effects that the direct current sensor and the alternating current sensor are integrated in the same module, so that the number of hardware in the inverter is reduced, and the production and maintenance cost can be reduced while the complexity and the occupied space of the system are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of current detection, and in particular to an AC / DC integrated sensor and a current detection architecture. Background Art

[0002] In existing photovoltaic inverter designs, independent DC current sensors and AC current sensors are usually used to meet the needs of MPPT control and AFCI protection respectively. Specifically, the MPPT module detects the output current of the photovoltaic module in real time through the DC current sensor to achieve power optimization; while the AFCI module relies on the AC current sensor to monitor the current waveform changes to detect possible arc faults and take protective measures.

[0003] Since the DC and AC current sensors are respectively set in the MPPT and AFCI modules, this separate design increases the complexity of the internal structure of the photovoltaic inverter, occupies more hardware resources, leads to higher production and maintenance costs, and is not conducive to the miniaturization and lightweight of the equipment; for application scenarios that require a compact layout, the existing technology is difficult to meet the needs. In addition, the decentralized design system is more complicated in the process of fault location and repair, which increases the difficulty of maintenance. Summary of the invention

[0004] One of the objectives of the present application is to provide an AC / DC integrated sensor that can solve at least one of the defects in the above-mentioned background technology.

[0005] Another object of the present application is to provide a current detection architecture that can solve at least one of the defects in the above-mentioned background technology.

[0006] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: an AC / DC integrated sensor, applied to multi-channel MPPT control and AFCI arc fault protection scenarios of inverter systems; comprising a CT coil, a plurality of Hall elements and a plurality of C-shaped magnetic cores; the plurality of magnetic cores are arranged close to each other through a side away from an air gap, and the wire to be detected is suitable for independently passing through a single magnetic core; the CT coil is wound around the close area of ​​all the magnetic cores to cooperate to form an AC sensor for detecting the alternating current of the wire; the Hall element is correspondingly arranged at the air gap position of each of the magnetic cores, so that the Hall element and the magnetic core cooperate to form a DC sensor for detecting the direct current of the wire.

[0007] Preferably, the number of the magnetic cores is two, and the two magnetic cores are symmetrically arranged close to each other; the current directions of the two wires independently passing through the magnetic cores are in the same direction.

[0008] Preferably, the number of the magnetic cores is greater than two, and all the magnetic cores are arranged close to each other at equal intervals along the circumferential direction; the directions of currents of the multiple wires independently passing through the magnetic cores are in the same direction along the circumferential direction.

[0009] Preferably, the plurality of magnetic cores are arranged close to each other via an isolation structure so that adjacent magnetic cores do not contact each other.

[0010] Preferably, adjacent magnetic cores are spaced apart to form the isolation structure.

[0011] Preferably, adjacent magnetic cores are connected via a shielding layer to form the isolation structure.

[0012] Preferably, the AC / DC integrated sensor also includes an AC signal conditioning module and multiple DC signal conditioning modules; the DC signal conditioning module is suitable for receiving the detection data of the DC sensor and extracting the DC signal component; the AC signal conditioning module is suitable for receiving the detection data of the AC sensor and processing it, thereby obtaining an AC current signal containing an arc characteristic frequency band.

[0013] Preferably, the DC signal conditioning module includes an amplifier circuit and a low-pass filter circuit connected in sequence; the amplifier circuit is suitable for converting the Hall voltage generated by the Hall element into a current signal and amplifying it, and the low-pass filter circuit is suitable for filtering the amplified current signal to extract the DC signal component.

[0014] Preferably, the AC signal conditioning module includes a conversion circuit and a bandpass filtering circuit connected in sequence; the conversion circuit is suitable for converting the induced electromotive force generated by the CT coil into a current signal and amplifying it; the bandpass filtering circuit is suitable for filtering the converted current signal to retain the current signal in the arc characteristic frequency band.

[0015] A current detection architecture is applied to an inverter system, comprising a plurality of the above-mentioned AC / DC integrated sensors, an AFCI detection module and a DSP main control module; the power generation units of the inverter system are divided into a plurality of groups, and the wires corresponding to the plurality of power generation units in each group respectively pass through the corresponding AC / DC integrated sensors to simultaneously detect AC signals and DC signals; the AFCI detection module is suitable for connecting to all the AC / DC integrated sensors, thereby receiving all AC signals in real time for AFCI arc fault monitoring; the DSP main control module is suitable for connecting to all the AC / DC integrated sensors, thereby receiving all DC signals in real time for MPPT control.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] (1) The structure of the entire AC / DC integrated sensor is simple. By integrating DC and AC sensors into the same module, the amount of hardware inside the inverter is reduced, which reduces system complexity and space occupation, as well as production and maintenance costs.

[0018] (2) By integrating DC and AC sensors, real-time synchronous acquisition and processing of the two signals can be achieved, reducing the delay between the signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of one example of an AC / DC integrated sensor of the present application.

[0020] Figure 2 For this application Figure 1 Equivalent simplified schematic diagram of the illustrated embodiment.

[0021] Figure 3 This is a schematic structural diagram of another example of an AC / DC integrated sensor in this application.

[0022] Figure 4 For this application Figure 3 The illustrated embodiment is a schematic diagram of the wire installation structure when current detection is performed.

[0023] Figure 5 This is a schematic diagram of the structure of the AC / DC integrated sensor of the present application for outputting detection signals.

[0024] Figure 6 Schematic diagram of the circuit architecture of the DC signal conditioning module in this application.

[0025] Figure 7 Schematic diagram of the circuit architecture of the AC signal conditioning module in this application.

[0026] Figure 8 Schematic diagram of the structure of the current detection architecture of the inverter system in this application.

[0027] In the figure: DC sensor 10, isolation structure 100, magnetic core 11, air gap 110, Hall element 12, CT coil 13, DC signal conditioning module 14, amplifier circuit 141, low-pass filter circuit 142, AC signal conditioning module 15, conversion circuit 151, band-pass filter circuit 152, AC sensor 20, wire 30, AFCI detection module 41, DSP main control module 42, ARM control module 43, cloud 44. DETAILED DESCRIPTION

[0028] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0029] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0034] One aspect of the present application provides an AC / DC integrated sensor, which is applied to multi-channel MPPT control and AFCI arc fault protection scenarios of inverter systems. Figure 1 and Figure 2 As shown, one preferred embodiment includes a CT coil 13, a plurality of Hall elements 12 and a plurality of C-shaped magnetic cores 11. The plurality of magnetic cores 11 are arranged close to each other by a side away from the air gap 110, and the wire 30 to be detected can independently pass through a single magnetic core 11. The CT coil 13 is wound around the close area of ​​all the magnetic cores 11 to cooperate to form an AC sensor 20 for detecting the AC power of the wire 30. The Hall element 12 is correspondingly arranged at the position of the air gap 110 of each magnetic core 11, so that the Hall element 12 and the magnetic core 11 cooperate to form a DC sensor 10 for detecting the DC power of the wire 30.

[0035] It should be known to those skilled in the art that the MPPT control of the inverter system needs to achieve power optimization based on the DC power information output by the power generation unit of the inverter system; while the AFCI arc fault protection needs to adopt protection measures for possible arc faults based on the current change waveform of the inverter system. That is, in the inverter system, in order to simultaneously achieve MPPT control and AFCI arc fault protection, it is necessary to perform AC and DC detection on the power generation unit side conductor 30 of the inverter system.

[0036] For the traditional AC / DC detection method used for MPPT control and AFCI arc fault protection, it is usually required that each current channel of the inverter system is equipped with a DC current sensor to ensure independent and accurate monitoring of the DC current of each channel; at the same time, in order to monitor the high-frequency AC current of the arc, each or multiple channels also need to be equipped with an additional AC current sensor. However, the above-mentioned DC current sensors and AC current sensors are distributed in different channels, work independently, and are far away from each other, which makes this design relatively low in integration, occupies a large space, and requires a relatively high cost.

[0037] In the present embodiment, an AC sensor 20 for detecting high-frequency AC current is formed by designing a plurality of magnetic cores 11 close together and winding them, and a Hall element 12 is installed at the position of the air gap 110 of the magnetic core 11 to form a DC sensor 10 for detecting DC current. The above-mentioned design has a simple structure, and the DC sensor 10 and the AC sensor 20 can be integrated into the same sensor structure, thereby reducing the number of hardware inside the inverter to reduce system complexity and occupied space, and can also reduce the cost of production and maintenance. In addition, the plurality of magnetic cores 11 can form a plurality of efficient current measurement channels, thereby improving the integration of the system. At the same time, by integrating the DC sensor 10 and the AC sensor 20, the real-time synchronous acquisition and processing of the AC and DC signals of the conductor 30 can be realized, thereby reducing the delay between the signals to improve the AC and DC detection efficiency of the inverter system.

[0038] It should be known that in order to ensure the uniform winding of the CT coil 13, the structure of the magnetic core 11 is a C-shaped structure with an air gap 110 formed on one side of the "mouth"-shaped structure. The specific number of magnetic cores 11 constituting the AC / DC integrated sensor of this application can be set according to actual needs; if the inverter system has more power generation units, the number of magnetic cores 11 constituting a single AC / DC integrated sensor will be more, so that the AC / DC detection of the inverter system can be realized with as little hardware as possible. However, if there are too many current measurement channels formed by a single AC / DC integrated sensor, the installation of the wire 30 will be affected due to the close distance between adjacent measurement channels. At the same time, the magnetic fields formed in adjacent measurement channels may also interfere with each other; therefore, the local arrangement of the AC / DC integrated sensor formed by different numbers of magnetic cores 11 and the insertion method of the wire 30 are different, which will be explained in detail through two specific examples below.

[0039] Example 1: Figure 1 and Figure 2 As shown, there are two magnetic cores 11 , which are symmetrically arranged close to each other; the current directions of the two wires 30 independently passing through the magnetic cores 11 are in the same direction.

[0040] It can be understood that when the AC / DC integrated sensor shown in Example 1 is working, the two currents pass through the corresponding magnetic cores 11 through the corresponding wires 30, and induce corresponding magnetic fields in the respective magnetic cores 11. The Hall element 12 installed at the air gap 110 position of each magnetic core 11 can independently measure the single current. The CT coil 13 shared by the two magnetic cores 11 can simultaneously detect the magnetic field changes in the two magnetic cores 11 through the principle of electromagnetic induction, thereby obtaining the signal component of the AC current. The direction of the magnetic field in the two magnetic cores 11 is as follows: Figure 1 The above design ensures reliable separation and detection of DC and AC currents, and realizes compact structure and low mutual interference integrated design in multi-channel current measurement.

[0041] Example 2: The number of magnetic cores 11 is greater than two, for example Figure 3 and Figure 4 As shown, there are four magnetic cores 11. All magnetic cores 11 are arranged close to each other at equal intervals along the circumferential direction; the current directions of the multiple wires 30 independently passing through the magnetic cores 11 are in the same direction along the circumferential direction.

[0042] It is understandable that the specific working principle of Example 2 is basically the same as that of Example 1; compared with Example 1, Example 2 can provide more DC measurement channels. By arranging the wires 30 in the same circular direction, it can be ensured that multiple wires 30 can pass through smoothly, thereby avoiding the disorder of the arrangement of the wires 30.

[0043] In this embodiment, Figure 1 and Figure 3 As shown, the plurality of magnetic cores 11 are arranged close together through an isolation structure 100 so that adjacent magnetic cores 11 do not contact each other, thereby reducing or avoiding mutual interference of magnetic fields on adjacent magnetic cores 11 .

[0044] It is understandable that if some or all of the magnetic cores 11 in the AC / DC integrated sensor are arranged close to each other in contact, the magnetic field generated by each magnetic core 11 through electromagnetic induction may cause a coupling effect across the magnetic core 11 in the close area, so that the current fluctuation amplitude of the single magnetic core 11 detected by the CT coil 13 increases, which may cause a false alarm of the AFCI arc fault. Therefore, when designing the AC / DC integrated sensor, it is necessary to set an isolation structure 100 to isolate adjacent magnetic cores 11 to ensure that the magnetic lines of force generated by each current are only closed in the corresponding magnetic core 11, reducing or avoiding the occurrence of the coupling effect across the magnetic core 11.

[0045] Specifically, there are many specific implementations of the isolation structure 100 that can achieve the above effect, and the common methods are mainly the following two. The first method: adjacent magnetic cores 11 are spaced to form an isolation structure 100; the second method: adjacent magnetic cores 11 are connected by a shielding layer to form an isolation structure 100. The specific material of the shielding layer is well known to those skilled in the art, so it will not be elaborated in detail here, as long as it can isolate the electromagnetic field.

[0046] In this embodiment, Figure 5 As shown, the AC / DC integrated sensor also includes an AC signal conditioning module 15 and a plurality of DC signal conditioning modules 14. The specific number of the DC signal conditioning modules 14 is equal to the number of the DC sensors 10 formed by the magnetic core 11. The DC signal conditioning module 14 can be connected to the corresponding DC sensor 10, so as to receive the detection data of the DC sensor 10 and extract the DC signal component. The AC signal conditioning module 15 can be connected to the AC sensor 20, so as to receive the detection data of the AC sensor 20 and process it, and then obtain an AC current signal containing the arc characteristic frequency band.

[0047] It can be understood that the DC sensor 10 in this embodiment mainly relies on the Hall effect to convert the current signal in the wire 30 into a potential difference; the AC sensor 20 mainly relies on the electromagnetic induction principle to convert the current signal in the wire 30 into an induced electromotive force. That is, the signals collected by the DC sensor 10 and the AC sensor 20 are all voltage signals, and the required current signals cannot be directly obtained. The corresponding conditioning modules are required to output the corresponding DC current signals and AC current signals.

[0048] In this embodiment, the DC signal conditioning module 14 can amplify the signal data collected by the DC sensor 10 to ensure that the signal strength is suitable for subsequent measurement and analysis; at the same time, the DC signal conditioning module 14 can also filter the amplified signal to suppress noise and interference to obtain accurate DC signal components. The amplified and filtered signal is more stable and has a higher signal-to-noise ratio, so that it can more accurately reflect the actual current changes. There are many specific structures of the DC signal conditioning module 14 that can achieve the above functions. For ease of understanding, a specific structure will be described in detail below.

[0049] Specifically, Figure 6As shown, the DC signal conditioning module 14 includes an amplifier circuit 141 and a low-pass filter circuit 142 connected in sequence. The input end of the amplifier circuit 141 can be connected to the Hall element 12, so that the Hall voltage generated by the Hall element 12 can be input into the amplifier circuit 141 to be converted into a current signal and amplified. The low-pass filter circuit 142 can receive the amplified current signal and filter it, thereby extracting the DC signal component to facilitate MPPT control.

[0050] It should be known that the specific structures and working principles of the amplifier circuit 141 and the low-pass filter circuit 142 are well known to those skilled in the art, and thus will not be elaborated in detail herein.

[0051] In this embodiment, the AC signal conditioning module 15 amplifies the induced current signal sensed by the CT coil 13 to increase its amplitude and ensure that the subsequent detection unit can accurately read the signal. At the same time, the AC signal conditioning module 15 can also filter the amplified induced current signal to retain the signal of the arc characteristic frequency band; after amplification and filtering, the AC signal conditioning module 15 can output an AC current signal containing the arc characteristic frequency band. There are many specific structures of the AC signal conditioning module 15 that can realize the above functions. For the sake of easy understanding, a specific structure will be described in detail below.

[0052] Specifically, Figure 7 As shown, the AC signal conditioning module 15 includes a conversion circuit 151 and a bandpass filter circuit 152 connected in sequence. The conversion circuit 151 can convert the induced electromotive force generated by the CT coil 13 into a current signal and amplify it. The bandpass filter circuit 152 can filter the converted current signal to retain the current signal in the arc characteristic frequency band, thereby facilitating the AFCI arc fault judgment.

[0053] It is understandable that the basic architecture of the amplifier circuit 141 in the DC signal conditioning module 14 and the conversion circuit 151 in the AC signal conditioning module 15 are consistent. Both circuits can be regarded as a signal amplification circuit, which can achieve voltage-current conversion through a negative feedback mechanism while achieving signal amplification. The specific conversion process is a well-known technology for those skilled in the art, so it will not be elaborated in detail here.

[0054] In this embodiment, the AC / DC integrated sensor can be packaged and designed for use. Figure 5As shown, the packaged AC / DC integrated sensor has mounting holes corresponding to each magnetic core 11 to form a measurement channel, which can be used for the corresponding passage of the wire 30 to be detected. The packaged AC / DC integrated sensor is provided with a power interface VCC, a common ground interface GND, a DC signal output interface DC, and an AC signal output interface AC. Among them, the power interface VCC is used to connect the power supply to power the AC signal conditioning module 15 and the DC signal conditioning module 14; the common ground interface GND is used to ground the AC signal conditioning module 15 and the DC signal conditioning module 14; the DC signal output interface DC is connected to the DC signal conditioning module 14 to respectively output the corresponding DC signals; the AC signal output interface AC is connected to the AC signal conditioning module 15 to output the corresponding AC signal.

[0055] It should be known that the number of DC signal output interfaces DC corresponds to the number of DC signal conditioning modules 14, that is, the number of magnetic cores 11. Taking the above example 1 as an example, the number of DC signal output interfaces DC is two, which can be marked as DC1 and DC2 respectively.

[0056] Another aspect of the present application provides a current detection architecture, which is applied to an inverter system; Figure 8 As shown, one of the preferred embodiments includes a plurality of the above-mentioned AC / DC integrated sensors, an AFCI detection module 41 and a DSP main control module 42. The power generation units of the inverter system can be divided into multiple groups according to a set number, and the multiple power generation units in each group correspond to an AC / DC integrated sensor. The wires 30 corresponding to the multiple power generation units in each group respectively pass through the measurement channels on the corresponding AC / DC integrated sensors to simultaneously detect AC signals and DC signals. The AFCI detection module 41 is connected to the AC signal output interface AC of all AC / DC integrated sensors through a port, so that all AC signals can be received in real time for AFCI arc fault monitoring of the inverter system. The DSP main control module 42 can be connected to the DC signal output interface DC of all AC / DC integrated sensors through an interface, so that all DC signals can be received in real time for MPPT control of the inverter system.

[0057] For ease of understanding, the following will take the specific structure of the AC / DC integrated sensor as an example for detailed description. Taking the photovoltaic power generation system as an example, Figure 8 As shown, since each AC / DC integrated sensor includes two magnetic cores 11, the PV units of the photovoltaic power generation system can be divided into N groups of two; the output end wires 30 of the two PV units in each group pass through the two measurement channels of the AC / DC integrated sensor respectively. The AC signals output by all AC / DC integrated sensors are AC #1 , AC #2 ,……,AC #NThe AFCI detection module 41 determines the arc fault condition of the photovoltaic power generation system according to the received AC signal. The DC signals output by all AC / DC integrated sensors are DC #1_1 、DC #1_2 、DC #2_1 、DC #2_2 ,……,DC #N_1 、DC #N_2 The DSP main control module 42 performs MPPT control on the photovoltaic power generation system according to the received DC signal.

[0058] It should be known that the specific structures and working principles of the AFCI detection module 41 and the DSP main control module 42 are well known to those skilled in the art, and therefore will not be elaborated in detail herein.

[0059] In this embodiment, Figure 8 As shown, the current detection architecture also includes an ARM control module 43, which can communicate with the DSP main control module 42 and the AFCI detection module 41, so that the feedback results of the DSP main control module 42 and the AFCI detection module 41 can be received and uploaded to the cloud 44 to facilitate remote monitoring, fault analysis and processing, thereby improving the safety and intelligence level of the system. The specific structure and working principle of the ARM control module 43 are well-known technologies to those skilled in the art, so they will not be elaborated in detail here.

[0060] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An AC / DC integrated sensor, applied to multi-channel MPPT control and AFCI arc fault protection scenarios of inverter systems; characterized in that: include: A plurality of C-shaped magnetic cores; the plurality of magnetic cores are arranged close to each other through a side away from the air gap, and the wire to be detected is suitable for independently passing through a single magnetic core; CT coil; the CT coil is wound around the close area of ​​all the magnetic cores to cooperate to form an AC sensor for detecting AC current in the conductor; as well as A plurality of Hall elements; the Hall elements are arranged correspondingly at the air gap positions of the magnetic cores, so that the Hall elements and the magnetic cores cooperate to form a DC sensor for detecting the DC current of the conductor.

2. The AC / DC integrated sensor according to claim 1, characterized in that: There are two magnetic cores, which are symmetrically arranged close to each other; the current directions of two wires independently passing through the magnetic cores are in the same direction.

3. The AC / DC integrated sensor according to claim 1, characterized in that: The number of the magnetic cores is greater than two, and all the magnetic cores are arranged close to each other at equal intervals along the circumferential direction; the current directions of the multiple wires independently passing through the magnetic cores are in the same direction along the circumferential direction.

4. The AC / DC integrated sensor according to claim 2 or 3, characterized in that: The plurality of magnetic cores are arranged close to each other through an isolation structure so that adjacent magnetic cores do not contact each other.

5. The AC / DC integrated sensor according to claim 4, characterized in that: Adjacent magnetic cores are spaced apart to form the isolation structure.

6. The AC / DC integrated sensor according to claim 4, characterized in that: Adjacent magnetic cores are connected via a shielding layer to form the isolation structure.

7. The AC / DC integrated sensor according to claim 1, characterized in that: The AC / DC integrated sensor also includes: A plurality of DC signal conditioning modules; the DC signal conditioning modules are adapted to receive detection data of the DC sensor and extract DC signal components; and AC signal conditioning module; the AC signal conditioning module is suitable for receiving and processing the detection data of the AC sensor, thereby obtaining an AC current signal containing an arc characteristic frequency band.

8. The AC / DC integrated sensor according to claim 7, characterized in that: The DC signal conditioning module includes an amplifier circuit and a low-pass filter circuit connected in sequence; The amplifier circuit is suitable for converting the Hall voltage generated by the Hall element into a current signal and amplifying the current signal, and the low-pass filter circuit is suitable for filtering the amplified current signal to extract a DC signal component.

9. The AC / DC integrated sensor according to claim 7, characterized in that: The AC signal conditioning module includes a conversion circuit and a bandpass filter circuit connected in sequence; The conversion circuit is suitable for converting the induced electromotive force generated by the CT coil into a current signal and amplifying it; the bandpass filter circuit is suitable for filtering the converted current signal to retain the current signal in the characteristic frequency band of the arc.

10. A current detection architecture, applied to an inverter system, wherein the power generation units of the inverter system are divided into multiple groups; characterized in that: include: A plurality of AC / DC integrated sensors according to any one of claims 1 to 9; the wires corresponding to the plurality of power generation units in each group pass through the corresponding AC / DC integrated sensors respectively to detect AC signals and DC signals simultaneously; AFCI detection module; the AFCI detection module is suitable for connecting with all the AC / DC integrated sensors, thereby receiving all AC signals in real time for AFCI arc fault monitoring; as well as DSP main control module; the DSP main control module is suitable for connecting with all the AC and DC integrated sensors, and then receiving all DC signals in real time for MPPT control.

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